Scientists believe since 2010 we have entered the sixth period of mass extinction. CO2 emissions will change the lives of plants and animals in the next three to four decades.

Nearly one-third of tropical animal species face extinction if humans do not curb our growing appetites for beef, pork and other land-intensive meats. The Panamanian golden frog bred by the Vancouver Aquarium in this 2014 file photo may be extinct in its natural habitat.
(THE CANADIAN PRESS/Darryl Dyck)July 17, 2017